Multi-shot injection molding also known as twin-shot injection molding, is a process where two or more colors and / or materials are injected simultaneously into a mold, creating one or multiple components.

Essentially, the molding process remains the same as traditional injection molding. However, the integration of additional injection units is required. Commonly the number of the additional injection units can range from 2 to 6, one for each material or color.

This process is advantageous when it’s necessary to combine different material properties into a single component. Materials commonly used for this process include thermoplastics, thermosets and liquid silicone rubber. In these cases, it is essential that the materials have a common adhesive quality, this ensures that the individual components of the final component are securely bonded.